One of David’s terrible jokes – Schwarzenegger the music lover

Steven Spielberg had an original idea. He decided to make an action film about classical composers. He contacted 3 action heroes to play the different parts.
He said to Bruce Willis: “Hey Bruce! Which composer do you want to play?”
Bruce said: “I love Mozart. Can I play Mozart?”
“Yeah! Sure!” said Spielberg. “And you, Stallone. Who do you want to play?”
Stallone said: “I love Beethoven. I would love to play Beethoven in this film. Is that OK?”
“That’s fine.” said Spielberg. “And you, Arnold. Who would you like to be in the film?”
Schwarzenegger thought for a few moments, and then he said :
“I’ll be Bach!”